Lithium polymer rechargeable battery suitable for: Set 900, RI 900, Set 840-TV, RR 840, Set 840 S, RR 840 S, Set 830-TV, RI 830, Set 830 S, RI 830 S, IS 410, RI 410, RS 4200, RR 4200, HDI 830.

**THIS PRODUCT HAS BEEN DISCONTINUED - If your current model is one of the above listed, we highly recommend the current, Sennheiser Set 860 linked